摘要
选择素(selectin)与配体相互作用在诸如炎症反应、肿瘤转移等生物学过程中具有重要作用;作用力影响受体-配体键解离。本文发展了基于光阱技术的新实验方法,用于考察P-选择素(P-selectin)与P-选择素糖蛋白配体-1(P-selectin Glycoprotein Ligand1,PSGL-1)相互作用的解离过程。采用黏滞力法对光阱刚度系数进行标定,并通过分子在玻璃小球表面的功能化表征,研究力作用下P-selectin/PSGL-1键的解离,得到了在较低加载率(<25pN/s)下键解离的断裂力分布,发现键的最可几断裂力随加载率而增加。实验结果在较低加载率下补充和验证了已有的结论。
Selectin/ligand interaction plays an important role in such biological processes as inflammatory reaction, tumor metastasis, etc. External forces affect dissociation of receptor-ligand bonds. A novel approach, upon optical trap technique, was developed in this study to investigate the dissociation of P-selectin/PSGL-1 （P- Selectin Glycoprotein Ligand 1） bindings. Stiffness of optical trap was calibrated with laser power using a viscous drag method. While P-selectin and PSGL-1 molecules were functionally coated on surfaces of glass beads, respectively, the dissociation of interacting molecule bond was studied by measuring the rupture force distribution. It was found that most probable rupture force increased with loading rate at （25 pN/s. These results complemented and validated the current theory at low loading rates.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
2005年第5期961-965,共5页
Journal of Biomedical Engineering
基金
国家自然科学基金资助项目(10332060/30225027/10128205)
中国科学院知识创新工程资助项目(KJCX2-SW-L06)
中国科学院力学所创新领域前沿资助项目
